Changing thread ID's to match those of deleted threads

[Lynne]

I've never tried to do that before, but you would need to change the thread.threadid field as well as the post.threadid for all the posts in that thread. Possibly threadviews.threadid (if that matters to you).

I would strongly recommend doing this on a database backup first. And, make sure you do a database backup before doing it on your live site also.